Multiple tube, convergent line oscillator



July 1, 19 52 PAGE 2,602,141

MULTIPLE TUBE, CONVERGENT LINE OSCILLATOR Filed NOV. 20, 1942 2 SIIEETS-SIEET l gwuw bo'v ROBERT M. PAGE July 1, 1952 PAGE 2,602,141

MULTIPLE TUBE, CONVERGENT LINE OSCILLATOR Filed NOV. 20, 1942 2 SI-iEETSSHEET 2 Patented July 1, 19 52 W 4 2,602,141 I MULTIPLE TUEE, ooNVEitenN'r'LmE "1" 1' osoinLA'ro'a Robert M. llagewashington; I Y

Application mem e 20, was rel i519; 4662925 40mm; (Cl. 250-36 ,l ream-ma th act of u amended Aprll 3Q, 1928;

many difficulties are encountered.

. --,For example, it is not feasible to increase-power at these frequencies by. adding tubes in parallel since thetubeimpedance is .too lowand-intenelectrode capacity istoo high. Itisnecessary to avoid circuits which require matching of tubes by special selection. The oscillator should also re.- spend faithfully to modulation potentials as does .a one or twoetube oscillator.- Spaceiand weight considerations sometimes are likewise of'high im-.

It is among the several objectszof .the-inven-i tion to provide a light and compact multiple tube single-phase oscillator having short leads, which will faithfully respond-to modulation potentials and the tubes of which need not be matched by special selection. A

Other objectswill become apparent from a careful considerationof" the following description, when taken together with the accompanyme drawingainwhich: a

:Fig. 1 isia schematicv circuit diagram of an oscillator embodying the invention-and s ;-Fig. 2 is a schematic circuit diagram of another embodiment of theinventionv 1 Figs.3 and 4 show in partial perspective, the embodiments illustrated respectively in Figs. "1 and 2. J

In Figs. 1 and 3 are shown four'tubes 10, I, I2 and [3 having their grids connected to a'commonl point by means of a'four-wire convergent frame. The plates are connected to a. common point l5 through a similar convergent frame. Each side of the filaments is connected to a separate two-wire convergent frame, the two frames being inductively coupled and the filaments of each oppositely located pair of tubes being connected in parallel to correspondingly located wires of the frames. Thus,.leads l8 and 20 connect corresponding sides of the filaments of tubes l0 and I2 and tubes II and 13 respectively to the wires 22 and 23 comprising one convergent frame and leads 1!! and 2| connect the opposite sides of the filaments of the same respective tubes to the two wires 24 and 25 comprising the other frame. The wires 22 and 25 extend in mutual parallelism, as likewise do wires 23 and 24. The filament frames should be approximately a quarter-wave length long and are tuned by means of tubes are employed forthisapurpose stateside-ts a e tnl tei rj me a a M r h: a. 1 .83am .1 94, 1 :42"

and' 21.; Thefpoint 15' is connected to a source of +3 voltage through resistor 28 and the point 14 is connected to the-B pu hlffii?! a .f e ee y a ti l- The 1 grid frame proportioned for the maxi:

mum: excitationwhich can be attained with stabilityif The filament frames are tunedto maxifi nd tm mea is mined rounding the plate or'gridf'framesi :B y wayof example, 'an oscillator properly adjusted for best. performanceat a wave length,

or; 56 centimeters had the following proportions andcharacteristics'. Acorn tubeswere employed. The plate frame was 2.5 inchesflo'ng' andthe grid frame was .1 inch long and, positioned inside the plate frame. The wires of the'filament frames werespaced about 2 inches apart at the open end and the length of the I from the pointof connection to the filament leads to the endiof the frame. Res stance 28 had a value oflOOO ohms and resistance 29" a value of 10;,0j0o a g 1.; t f

Figs; Q 2 and 4 show 2 Io I -itube oscillatorfem' 'loyin'g tubes having terminal] arrangements which 'd'olhot lend themselves to the type (if fstlfl'lc ture'fshown in Fig. 1. ,This embodiment em mys convergent, fourwire frames for the filament leads as well .as the grid"and platefleadsf The and nested, with the rid framesfare pyramidal frame on the inside, to which the -B voltage source through resistance 30. f The plate frame isp sitioned around 'the'grid frame, terminating in a ring 3 I to which connected the +13 voltage source through variable resistor 5 l. The two filament frames enclose the plate and grid frames and terminate in rings 32 and 33. The ring terminations allow the supply lines to be brought directly out through the end of the assembly. The four-wire frames are all pyramidal in form and the lines composing any one frame are of equal length although they do not always appear to be in the drawings.

' By way of example, the following proportions and circuit values have been employed to produce an oscillator operating at a wave length of 84 cm. Using type 316A tubes, the grid frame was 1 /2 inches from grid to terminating point, the plate frame was 2 /2 inches from plate to terminating ring and the and. 6 inches long respectively. one frame being two inches short to allow for two inches of filaterminating at point I' l ment lead within the tube envelopes.

frame was about. 4. inches,

is connected filament frames were 4 i Although only two embodiments of the present invention have been shown and describedin dethat various changes and substitutions may be made therein without departing from. thespirit of the invention as Well understood .by those.

skilled in the art. Reference'therefore will be .10 tail heretofore, it is to be expressly understood.

anode, a convergent line frame connecting said control grids and comprising a conductor devoid of lumped reactance leading from each of said grids to a common point outside of said plane, a similar frame connecting said anodes together in acon'imon point outside the plane of said devices, saidanode.framebeingpositioned to surround the grid frame, means including a first quarter wave two wire convergent line frame connecting ,one. side of the filaments of said devices-together; and means including a second quarter wave two wire convergent line frame connecting the other side of the filaments of had-to the appended claims as a definition of the limits of the invention.

The invention described herein inay be manu factured and used by or for theGovernment of the United States of America for governmental purposes without the; payment of any royaltiesthereon or therefor. f

- rclaim:

said devices together. said first and second filament convergent line frames being so positioned asto be inductively coupled.

4. An oscillation generator comprising an even number ofelectron discharge devices intersected by aplane 'and"symmetrically positioned with 1. An oscillation generator'compri'singlaneven number or; electron discharge devices intersected by a'-plane and symmetrically disposed with reg'ard to a; pointin said-plane; eachof-said; devices; comprising an anodafia controrgrid'andanelectron-'emitting electrode, an anode frame -for-saiddevices comprising separate; equal. length; converging conductors connecting said anodes together in a comment-point outside the plane. of said devices, and a' grid "frame for" said devices comprising" separate; equal length", converging conductorsyconnecting aid grids together in a common point i also; outside. of the plane of said j 2. Anzosci llaltion'generatorcomprising ameven number felectmni discharge; 'devices'intersected by'a' planefand symmetrically disposed-with regardto apointtherein, each ofsaid'devices comprising a plate; a control grid and an electron-v emitting electrode. a pyramidal convergent wire regard to a point in said plane, each of said device xcomprising a filament; is control'grid-and an anode-, a conver'gent:lineirame connecting said controlY-grids andicompris'ing 'a conductor devoid cflumped reactance' leading from" each of said grids to.=.a common point outside of said plane,

' a-similarframe-connecting said anodes-together frame "connecting said icontrohgrms together in a common pointjoutside iheplaneofsaid devices.

a similar pyramidal, convergent wire frame connectirig 'fsai'd. platesftogiether in a common point outside the plane; of sfaid" devices,- and a pair of convergentwre frames. each connecting together \3." An' oscillation generator comprising. an even. number ofelectron' discharge devices intersected by aplanefand synimetrically positioned with re'- gard'to a-poin'tin saidfplane, each of saiddevicesf comprising a, filament a control grid and. an

fctroneemitting electrodes of;

in a common point outside 'thejplaneof saiddevices. said i anode frame'being: positioned to surroundi-the'i grid-Lframe, meansincluding a first quarter'iwavetwo wire convergent line frame connecting" one side 0f the 'illaments ofsaid d'evices together, Land l'me'ans including a second quarterwavetwo wire'convergent line frame connecting theiotherwsideof the filaments "of; said devices together,. said iifirst-and second" filament con-- vergent; line-frames being 1 so positioned. 7 as to be inductively coupled filamentvframesl" 1 RQB E-RT'MiPAGE;

,- :REEERENCESHCITED" v I The following references" are of record in the file-ofthis patentr V '1 "j UNITEDS'IATESPAIENTS and means for tuning: saidermany Dec; 19,1928; 

